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  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
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<body>

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<script>
  console.dir(Array);
  console.dir(String);
  console.dir(Date);
  console.dir(RegExp);
  console.dir(Promise);

  Array.prototype.say = function () {
    // this -> 调用此方法的实例化对象
    console.log("嘿嘿", ...this);
  }
  Array.prototype.myEach = function (fn) {
    // this -> 调用此方法的实例化对象
    for (var i = 0; i < this.length; i++) {
      var item = this[i];
      var index = i;
      var array = this;
      fn(item, index, array);
    }
  }

  var arr = new Array(1, 2, 3, 4);
  console.log(arr);
  console.log(arr.constructor);
  arr.say();

  arr.myEach(function (item, index, array) {
    console.log(item, index, array);
  })

  var brr = ["a", "b", "c"];
  console.log(brr);





</script>

</html>